Overview

GSI has the exciting potential to be used as a routine scan acquisition
mode offering additional anatomical and functional information to help expedite
and assist in an accurate CT diagnosis.

Gemstone Spectral Imaging (GSI) is a novel dual energy application that
uses rapid kV switching to acquire the dual energy samples almost
simultaneously to generate material density data that can be used for the
separation of materials and derivation of monochromatic spectral images using a
projection based reconstruction algorithm.

System Requirements

Intended Use

The GSI Viewer accepts images from a CT System
that can acquire CT images using different kV levels of the same anatomical region
of a patient in a single rotation from a
single source. The differences in the energy
dependence of the attenuation coefficient of the different materials provide
information about the chemical composition of body materials. This approach
enables images to be generated at energies selected from the available spectrum
to visualize and analyze information about anatomical and pathological
structures.

GSI provides information of the chemical
composition of renal calculi by calculation and graphical display of the
spectrum of effective atomic number. GSI Kidney stone
characterization provides additional
information to aid in the characterization of uric acid versus non-uric acid
stones. it is intended to be used on non-contrast studies as an adjunct to current
standard methods for evaluating stone etiology and composition.